Noise suppressing damper

Details Noise suppressing damper Noise suppressing damper

2008-01-16

2011-10-25

McAllister, Steven B (Department: 3749)

Ventilation

Having inlet airway

Including structure for mixing plural air streams together

C454S333000

Reexamination Certificate

active

08043148

ABSTRACT:
A damper is provided to suppress the abnormal noise or air noise at the small opening of the damper. The damper includes a wall surface which forms an air flow passage, a stationary portion which extends from the wall surface to the center of a flow passage, and a rotating portion rotatably disposed in the flow passage, having one end in contact with a portion of the stationary portion at a downstream side of an air flow through the flow passage. A curved wall portion as a convex curved surface protruding to the center of the flow passage is formed on a position of the wall surface on which the air flow passing between the one end and the stationary portion impinges.

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ASHRAE Handbook—Heating, Ventilating, and Air-Conditioning Applications (I-P Edition), 2007, section 47.10.
Supplementary European Search Report dated Oct. 4, 2010, issued in corresponding European Patent Application No. 08710549.0.

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